I,m shooting a 45/50 spine woodie with 135 gr.broadheads.Want to go to 165gr. broadheads.what spine shaft should I go with 50/55? Shooting them out of my HHbows.
Sounds ok, may have to go to 55-60
depending on the length of the shaft, 50-60 short shaft under 28" and 55-60 for 28" and above. That gives you play room for adjustment.
Assuming ALL other arrow specs are the SAME, a 30 Grain increase in point weight should require a 5# spine group increase. I'd start with one of your current arrows, remove the 135 and put a 165 on and see how it goes.
Arne
I agree with Moebow. Most bows will handle a range of spines quite nicely.